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Finding the Fourth Proportional to 1,139.29, 1,708.93 and 317.56

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Solution

The fourth proportional to 1,139.29, 1,708.93 and 317.56 is: 476.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.29 : 1,708.93 = 317.56 : x
  2. Step 2: Convert to fraction form
    1,139.29/1,708.93 = 317.56/x
  3. Step 3: Cross multiply
    1,139.29x = 1,708.93 × 317.56
  4. Step 4: Simplify right side
    1,139.29x = 542,687.81
  5. Step 5: Solve for x
    x = 542,687.81/1,139.29
  6. Step 6: Final answer
    x = 476.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.